class_docstr: Raw I/O implementation the input and output stream is resettable.
code: def writable(self):
      return True
  
file_path: flink/flink-python/pyflink/fn_execution/ResettableIO.py
imports: import io
label_desc: Use image node_id 7 for calling the ResettableIO obj's underlying member method code with example usage: obj.writable() and returns: True